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Hong-Yun, Xie; Lu, Wang; Ling-Juan, Zhao; Hong-Liang, Zhu; Wei, Wang . (2007). Optical microwave generation using two parallel DFB lasers integrated with Y-branch waveguide coupler. Chinese Physics, 16(5), 1459–1463. doi:10.1088/1009-1963/16/5/048 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research